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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3256b9aa7517734dbca6c1a50dca4a5caaa6d321504a2119d8e1e4a0eaff8ab7' 
  AND token = 'VN1QDIobhfg4vH9BX380FMH3jK6W1fkc/M7PN6nUCqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}